package com.atguigu.java2;

import com.atguigu.java1.Person;
import org.junit.Test;

import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.ArrayList;

/**
 * @author yihu
 * @create 2021-06-17 9:57
 * @email:1057202547@qq.com
 * @dec:
 */
public class OtherTest {
    /**
     * 获取构造器结构
     */
    @Test
    public void test(){
        Class<Person> clazz = Person.class;
        //getConstructors():获取当前运行时类中声明为public的构造器
        Constructor<?>[] constructors = clazz.getConstructors();
        for (Constructor cons:constructors){
            System.out.println(cons);
        }
        System.out.println("--------------------------------");
        //getDeclaredConstructors():获取当前运行时类中声明的所有的构造器
        Constructor[] declaredConstructors = clazz.getDeclaredConstructors();
        for(Constructor c : declaredConstructors){
            System.out.println(c);
        }
    }

     /*
      获取运行时类的父类
     */
     @Test
     public void test2(){
         Class clazz = Person.class;
         Class superclass = clazz.getSuperclass();
         System.out.println(superclass);
     }
    /*
     获取运行时类的带泛型的父类
    */
    @Test
    public void test3(){
        Class clazz = Person.class;

        Type genericSuperclass = clazz.getGenericSuperclass();
        System.out.println(genericSuperclass);
    }

    /*
        获取运行时类的带泛型的父类的泛型  ()
        代码：逻辑性代码  vs 功能性代码
     */
    @Test
    public  void test4(){
        Class clazz = Person.class;
        //父类的类型
        Type genericSuperclass = clazz.getGenericSuperclass();
        //带泛型的父类 （父类没有泛型会出现转换异常）
        ParameterizedType parameterizedType = (ParameterizedType) genericSuperclass;
        System.out.println(parameterizedType);
        //获取泛型类型
        Type[] actualTypeArguments = parameterizedType.getActualTypeArguments();
        for (Type t:actualTypeArguments){
            //System.out.println(t); //class java.lang.String
            //System.out.println(t.getTypeName()); //class java.lang.String
            System.out.println( ((Class)t).getName() ); //java.lang.String
        }
    }

    /*
      获取运行时类实现的接口
     */
    @Test
    public void test5(){
        Class<Person> clazz = Person.class;
        //获取取运行时类实现的接口
        Class[] interfaces = clazz.getInterfaces();
        for (Class i:interfaces){
            System.out.println(i.getName());
        }
        System.out.println("-------------------------------");

        //获取运行时父类实现的接口
        Class<?>[] interfaces1 = clazz.getSuperclass().getInterfaces();
        for (Class c:interfaces1){
            System.out.println(c.getName()); //java.io.Serializable
        }
    }

    /**
     * 获取运行时类所在的包
     */
    @Test
    public void test6(){
        Class<Person> clazz = Person.class;
        System.out.println(clazz.getPackage()); //com.atguigu.java1
    }

    /*
        获取运行时类声明的注解
     */
    @Test
    public void test7(){
        Class<Person> clazz = Person.class;
        Annotation[] annotations = clazz.getAnnotations();
        for (Annotation a:annotations){
            System.out.println(a); //@com.atguigu.java1.MyAnnotation(value=hi)

        }
    }


}



class  Student<T> {
    int age;
    String name;
    T data;
    public Student() {
    }

}







